Big Tech's $665 Billion AI Bet: Will the Capex Surge Pay Off?

The four largest US cloud platforms have collectively guided investors toward AI capital spending of as much as $665 billion in 2026, a roughly 75% increase from the $381 billion they spent in 2025. The number puts a hard figure on a build-out that has reshaped earnings calls, supply chains and the energy grid.

Alphabet, Amazon, Meta Platforms and Microsoft all delivered upbeat quarterly results, with cloud growth and AI demand cited as the engines. Yet equity markets have responded unevenly. Meta shares slid after the company telegraphed elevated capital expenditure of $125 billion to $145 billion, while Alphabet rallied on accelerating cloud revenue.

From scale to returns

The defining question for shareholders is shifting from whether the hyperscalers can spend enough to whether they can monetize the spending. Hardware depreciates quickly, training runs are getting more expensive, and downstream pricing remains under pressure. Companies like OpenAI and Anthropic are still chasing trillion-dollar valuations with limited reported profits, complicating the bull case.

For now, three signals matter: cloud revenue acceleration, durable enterprise AI bookings, and per-token unit economics. Earnings to date suggest the leaders can defend the spend; the laggards will face tougher questions when 2027 budgets are set.